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You searched for: subject:"digital systems"
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[texts]Aerobraking orbital transfer vehicle - NON
An aerobraking orbital transfer vehicle which includes an aerobraking device which also serves as a heat shield in the shape of a raked-off elliptic or circular cone with a circular or elliptical base, and with an ellipsoid or other blunt shape nose. The aerobraking device is fitted with a toroid-like skirt and is integral with the support structure of the propulsion system and other systems of the space vehicle...
Keywords: ASSOCIATIVE MEMORY; THIN FILMS; DIGITAL SYSTEMS; PATENTS
Downloads: 102
[texts]ISOMETRIC EXERCISES: A MEANS OF PREVENTING MUSCULAR ATROPHY IN THE TREATMENT OF FRACTURES OF THE EXTREMITIES - ATAYEV, Z. M
TESTS USING STATIC TENSION OF THE MUSCLES IMMOBILIZED FROM TRAUMAS TO PREVENT MUSCULAR ATROPHY WERE CARRIED OUT. IT WAS FOUND THAT ISOMETRIC TENSION OF THE MUSCLES LASTING 5 TO 7 SECONDS, USED IN A GENERAL COMPLEX OF PHYSICAL EXERCISES, IS AN EFFECTIVE MEANS OF PREVENTING MUSCULAR ATROPHY.
Keywords: DATA REDUCTION; MONOTONE FUNCTIONS; CONTRACTION; DIGITAL SYSTEMS
Downloads: 146
[texts]Prediction of Rotorcraft Pitch-Link Loads - Kottapalli, Ses
The pitch links of rotor blades are essential hardware that provide direct control to rotorcraft. The pitch-link loads undergo large changes in magnitude as a result of flight conditions that range from those of relatively benign level flight to those associated with severe, complex maneuvers. In the present study, a ''complex'' maneuver was defined as one that involved simultaneous non-zero aircraft angle of bank (associated with turns) and aircraft pitch rate (associated with a pull-up or a pu...
Keywords: DESIGN ANALYSIS; ARRAYS; INTERFEROMETERS; MISSION PLANNING; MODELS; DIGITAL SYSTEMS
Downloads: 30
[texts]Development of techniques for improving the reliability of digital systems through logical redundancy, phase iii final report - Baer, J. A.
Improving reliability of digital systems through logical redundancy
Keywords: COMPUTERS; DIGITAL SYSTEMS; IMPROVEMENT; REDUNDANCY; RELIABILITY; COMPUTER; REDUNDANT SYSTEM; RELIABILITY
Downloads: 112
[texts]The NIST automated computer-time service (Volume 94) - Levine, J.
Journal of Research of the National Institute of Standards and Technology
Keywords: propagation delay; automation; computers; delay; digital systems; frequency
Downloads: 99
[movies]Computer Imaging & Digitizing
A look at the use of personal computers to digitize and process images. Demonstrations include the Datacopy 830 Scanner, MacImage 2.0, TrueForm from Spectrum Digital, Image Studio from Fractal Software, and PicturePower Color System. Guests include Jerry Borrell of MacWorld, George Morrow of Nestar, and Gary Kildall of Digital Research. Originally broadcast in 1988.
Keywords: Datacopy; MacWorld; Specturm Digital Systems; Fractal Software; PictureWare
Downloads: 1,700
[texts]Survey of gas tubine control for application to marine gas turbine propulsion system control - Metz. Stephen D.;Smith, David L.
Progress report for period October 1984 - September 1985.
Keywords: CONTROL SYSTEMS; DIGITAL SYSTEMS; GAS TURBINES; MARINE ENGINES; MARINE PROPULSION
Downloads: 123
[texts]The two modes of visual processing: Implications for spatial orientation - Leibowitz, H. W.
The roles of the focal and ambient visual systems in spatial orientation are discussed. The two modes are defined and compared. The contribution of each system is illustrated through examples such as spatial disorientation/motion sickness, vehicle guidance/night driving, visual narrowing under stress/cortical brain damage, and aircraft instrumentation. Emphasis is placed on the need for testing procedures for the ambient system.
Keywords: MINERALS; RADIANCE; RADIOMETERS; RATIOS; ROCKS; SPECTRUM ANALYSIS; DIGITAL SYSTEMS; SPECTROMETERS
Downloads: 246
[texts]Development of techniques for improving the reliability of digital systems through logical redundancy final report - Goldberg, J.
Improved reliability of digital systems through logical redundancy techniques
Keywords: DIGITAL COMPUTERS; DIGITAL SYSTEMS; LOGIC CIRCUITS; REDUNDANCY; RELIABILITY; COMPUTER; DIGITAL COMPUTER; LOGIC CIRCUIT; RELIABILITY
Downloads: 96
[texts]Crystal cleaving machine - Hallberg, F. C
A machine is disclosed for cleaving hard crystals. A typical example of which is lithium fluoride, with prcision and uniformity and includes vertical axis positioning control means for an adjustable spring tension guided hammer mechanism employed to strike an anvil. A crystal cleaving shock wave transmitted to a cleaving blade is generated having an angulated cleaving edge in contact with one corner of the crystal...
Keywords: DIGITAL SYSTEMS; DIGITAL TECHNIQUES; SCRAMBLING (COMMUNICATION); SECURITY; SIGNAL ENCODING; TELECOMMUNICATION; BIT SYNCHRONIZATION; PSEUDORANDOM SEQUENCES
Downloads: 82
[texts]Application of radiation data to synoptic analysis and to studies of the general circulation - Winston, J. S
No Abstract Available
Keywords: DIGITAL SYSTEMS; HONEYCOMB STRUCTURES; SANDWICH STRUCTURES; CYLINDRICAL BODIES; DATA PROCESSING; QUALITY CONTROL
Downloads: 57
[texts]Spatial spark jitter measurements of highly charged nuclei for optical spark chambers - Smoot, G. F.
No Abstract Available
Keywords: APOLLO SPACECRAFT; DIGITAL SYSTEMS; DISPLAY DEVICES; INPUT/OUTPUT ROUTINES; TELEMETRY; COMMAND AND CONTROL; DATA PROCESSING; MONITORS
Downloads: 76
[texts]The Design of Collectives of Agents to Control Non-Markovian Systems - Lawson, John W.
The 'Collective Intelligence' (COIN) framework concerns the design of collectives of reinforcement-learning agents such that their interaction causes a provided 'world' utility function concerning the entire collective to be maximized. Previously, we applied that framework to scenarios involving Markovian dynamics where no re-evolution of the system from counter-factual initial conditions (an often expensive calculation) is permitted...
Keywords: DATA ACQUISITION; FLIGHT SIMULATION; NUMERICAL CONTROL; PERFORMANCE TESTS; TURBINES; MARKETING; HIGH SPEED; DIGITAL SYSTEMS; FUSION (MELTING)
Downloads: 96
[texts]Atomic Oxygen Durability Evaluation of a UV Curable Ceramer Protective Coating - Banks, Bruce A.
The exposure of most silicones to atomic oxygen in low Earth orbit (LEO) results in the oxidative loss of methyl groups with a gradual conversion to oxides of silicon. Typically there is surface shrinkage of oxidized silicone protective coatings which leads to cracking of the partially oxidized brittle surface. Such cracks widen and branch crack with continued atomic oxygen exposure ultimately allowing atomic oxygen to reach any hydrocarbon polymers under the silicone coating...
Keywords: DIGITAL SYSTEMS; DESIGN ANALYSIS; SYNCHRONISM; TIME FUNCTIONS; SYSTEMS ENGINEERING; CLOCKS; CIRCUITS; ARCHITECTURE (COMPUTERS)
Downloads: 76
[texts]Image enhancement software for underwater recovery operations - user's manual - Partridge, William J.;Therrien, Charles W.
Title from cover
Keywords: ALGORITHMS; COMPUTER PROGRAMS; DIGITAL SYSTEMS; DISPLAY SYSTEMS; IMAGE PROCESSING; VIDEO SIGNALS
Downloads: 51
[texts]Thermal coefficients of technology assimilation by natural systems - Mueller, R. F
Estimates of thermal coefficients of the rates of technology assimilation processes was made. Consideration of such processes as vegetation and soil recovery and pollution assimilation indicates that these processes proceed ten to several hundred times more slowly in earth's cold regions than in temperate regions. It was suggested that these differential assimilation rates are important data in planning for technological expansion in Arctic regions.
Keywords: COMPUTER PROGRAMS; DATA SYSTEMS; TEST FACILITIES; DATA PROCESSING; DATA REDUCTION; DIGITAL SYSTEMS; HISTOGRAMS; MAGNETIC TAPES
Downloads: 103
[texts]Sonic-boom characteristics in the extreme near field of a complex airpane model at Mach numbers of 1.5, 1.8, and 2.5 - Carlson, H. W.
Sonic boom characteristics in extreme near field of complex supersonic airplane model with pressure signature data
Keywords: DEEP SPACE NETWORK; DIGITAL SYSTEMS; INFORMATION SYSTEMS; TELEMETRY; SIGNAL TO NOISE RATIOS; SPACE COMMUNICATION; TELECOMMUNICATION
Downloads: 132
[texts]NASA geodynamics program - NON
The status, progress, and future plans of the program are given. A list of publications of research results supported by the program is included.
Keywords: AVIONICS; CENTRAL PROCESSING UNITS; ERROR DETECTION CODES; FAULT TOLERANCE; DIGITAL SYSTEMS; GATES (CIRCUITS); MICROPROCESSORS; SELF TESTS
Downloads: 139
[texts]GAS-DYNAMIC BANK CONTROL OF A SPACECRAFT IN THE ATMOSPHERE - STUDNEV, R. V
THE PONTRYAGIN MAXIMUM PRINCIPLE IS USED TO SOLVE THE PROBLEM OF OPTIMAL SPACECRAFT ATTITUDE CONTROL IN THE ATMOSPHERE. THE INFLUENCE OF AERODYNAMIC FORCES ON THE SPACECRAFT STABILITY IS CONSIDERED.
Keywords: CLOUDS (METEOROLOGY); FIRES; MAPPING; SATELLITE OBSERVATION; COMPUTERS; DIGITAL SYSTEMS; EUROPE; SMOKE TRAILS
Downloads: 112
[texts]Investigations of the 0.020-scale 88-OTS Integrated Space Shuttle Vehicle Jet-Plume Model in the NASA/Ames Research Center 11 by 11-Foot Unitary Plan Wind Tunnel (IA80) - Nichols, M. E
Tabulated pressure data are presented for the external tank and the external tank base. For abstract, see N76-33263.
Keywords: DIGITAL SYSTEMS; FLIGHT HAZARDS; FLY BY WIRE CONTROL; LIGHTNING; DESIGN ANALYSIS; ELECTROMAGNETIC RADIATION; RADIATION EFFECTS; VULNERABILITY
Downloads: 329
[texts]CALCULATION OF THE FLAPWISE BENDING, EDGEWISE BENDING, AND TORSIONAL VIBRATIONS OF ROTOR BLADES WITH COUPLED NATURAL MODES AND FREQUENCIES - OETTE, H
THE NATURAL-MODE-METHOD, PRESENTED BY GUILLENSCHMIDT, WAS EXPANDED FROM ONE TO TWO DEGREES OF FREEDOM, AND THEN TO THE THREE COUPLED DEGREES OF FLAPWISE BENDING, EDGEWISE BENDING AND TORSION. FOR THE COUPLED NATURAL MODES, WHICH ARE ASSUMED TO BE KNOWN, THE ORTHOGONAL RELATIONS ARE FORMULATED AND THE DIFFERENTIAL EQUATIONS FOR THE GENERALIZED DEGREES OF FREEDOM ARE DERIVED. THE THEORY WAS FURTHER EXTENDED BY ADDING THE MOMENT OF INERTIA DUE TO THE EXTENSION OF THE BLADE ACROSS TO ITS AXIS AND AP...
Keywords: DEFENSE COMMUNICATIONS SYSTEM (DCS); DIGITAL SYSTEMS; SYNCHRONISM; TIME MEASUREMENT; CLOCKS; MILITARY TECHNOLOGY; PULSE COMMUNICATION; VOICE COMMUNICATION
Downloads: 237
[texts]UTILIZATION OF WIND POWER IN AGRICULTURE IN THE USSR - STEIN, D
WIND MOTORS ARE BEING USED IN RUSSIAN AGRICULTURE FOR MILLING AND PUMPING WATER. PLANS CALL FOR RAPID EXPANSION OF THE UTILIZATION OF SUCH POWER PLANTS. THE EXTENT OF PRESENT UTILIZATION, PROBLEMS, AND FORECASTS ARE OUTLINED.
Keywords: ACTUATORS; DIGITAL SYSTEMS; ELECTRIC CONTROL; HYDRAULIC CONTROL; AIRCRAFT CONTROL; CONTROL SURFACES; CONTROL VALVES; PROTOTYPES; RELIABILITY ENGINEERING
Downloads: 131
[texts]Boundary-Layer Receptivity and Integrated Transition Prediction - Chang, Chau-Lyan
The adjoint parabold stability equations (PSE) formulation is used to calculate the boundary layer receptivity to localized surface roughness and suction for compressible boundary layers. Receptivity efficiency functions predicted by the adjoint PSE approach agree well with results based on other nonparallel methods including linearized Navier-Stokes equations for both Tollmien-Schlichting waves and crossflow instability in swept wing boundary layers...
Keywords: DIGITAL SYSTEMS; PREDICTION ANALYSIS TECHNIQUES; STRUCTURAL FAILURE; AGING (MATERIALS); ROOFS; COMMERCIAL AIRCRAFT; CIVIL AVIATION
Downloads: 154
[texts]Investigations of the 0.020-scale 88-OTS Integrated Space Shuttle Vehicle Jet-Plume Model in the NASA/Ames Research Center 11 by 11-Foot Unitary Plan Wind Tunnel (IA80) - Nichols, M. E
Tabulated force and pressure data are presented for the orbiter base and fuselage. For abstract, see N76-33263.
Keywords: AVIONICS; DIGITAL SYSTEMS; FAIL-SAFE SYSTEMS; AIRCRAFT GUIDANCE; DISPLAY DEVICES; FLIGHT CONTROL; INTERFACES; NAVIGATION; VULNERABILITY
Downloads: 252
[texts]THE ROLE OF WATER TEMPERATURE IN BRADYCARDIA DURING FACIAL IMMERSION - CORRIOL, J.
THE ROLE IS INVESTIGATED OF VARIATIONS IN WATER TEMPERATURE UPON BRADYCARDIA, OR STIMULUS-INDUCED CARDIAC DECELERATION. THIS PHENOMENON OCCURS AS A REFLEX WHEN THE HUMAN FACE IS IMMERSED IN WATER. USING TWELVE TEST SUBJECTS, THE AUTHORS CARRY OUT FACIAL IMMERSIONS AT VARIOUS WATER TEMPERATURES, ACCOMPANIED BY ACCURATE ELECTROCARDIOGRAPHIC MEASUREMENT. THROUGH STATISTICAL ANALYSIS, THE EFFECT OF WATER TEMPERATURE VARIATIONS UPON THE BRADYCARDIA REFLEX IS DEMONSTRATED...
Keywords: CALIFORNIA; FORESTS; TIMBER INVENTORY; DIGITAL SYSTEMS; EREP; MULTISPECTRAL BAND CAMERAS; MULTISPECTRAL BAND SCANNERS; SKYLAB PROGRAM
Downloads: 160
[texts]The moon and the planets (space program) - Denisov, V. P.
Study of the Moon and the planets nearest the earth, using space vehicles is considered. Information known to science today is presented concerning our closet neighbors, planets of the solar system, and the flights of space stations to the Moon, Mars, and Venus, and the role of man in the exploration and exploitation of space and the immediate objectives in exploration of the solar system.
Keywords: ANTENNA COMPONENTS; DIGITAL COMPUTERS; DIGITAL TECHNIQUES; SATELLITE TRACKING; STEERABLE ANTENNAS; DIGITAL SYSTEMS; SERVOMECHANISMS; SYSTEMS ENGINEERING
Downloads: 107
[texts]digitalMicrosystems :: digitalSystems :: FDC-3 Schematic
From the bitsavers.org collection, a scanned-in computer-related document.digitalMicrosystems :: digitalSystems :: FDC-3 Schematic
Keywords: digital; smift; systems; wnom; wws; setcslm; crcok; sheerzofi; mcbhab; clrcrc; digital systems
Downloads: 22
[texts]Lunar soil from the Sea of Fertility - NON
Physical, mechanical, and biological activity studies on lunar surface material from the Sea of Fertility returned by the Soviet Lunik 16 lunar probe.
Keywords: DIGITAL SYSTEMS; PULSE COMMUNICATION; TIME DIVISION MULTIPLEXING; CLOCKS; COST ESTIMATES; SYNCHRONISM; TOLERANCES (MECHANICS)
Downloads: 352
[movies]MIT RES.6-008 Digital Signal Processing, 1975
Instructor: Alan V. Oppenheim Set of 20 video lectures for Signals and Systems, an introductory course in analog and digital signal processing, including seismic data processing, communications, speech processing, image processing, consumer electronics, and defense electronics. View the complete course: http://ocw.mit.edu/RES6-008S11 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Keywords: signal processing; analog systems; digital systems; feedback; discrete-time signals; continuous-time signals; modulation; Fourier transformation
Downloads: 24,425
[texts]Deep Space Network control room noise and vibration study - Rayburn, J. C
Vibration and noise levels in two of the Deep Space Networks deep space station operations rooms were investigated as a cause of tracking equipment failures. Measured noise levels were compared to standard noise level criteria curves. Precision instrumentation was used to measure noise and vibration levels in the rooms and equipment racks. Findings resulting from analysis of the measured data coupled with onsite noise reduction tests are discussed.
Keywords: DATA SYSTEMS; DEEP SPACE NETWORK; TELEMETRY; BITS; CONFIGURATIONS; DIGITAL SYSTEMS; SYSTEMS ENGINEERING
Downloads: 74
[texts]Gravity and the cell: Intracellular structures and Stokes sedimentation - Todd, P
Plant and certain animal embryos appear to be responsive to the gravity vector during early stages of development. The convection of particle sedimentation as the basis for the sensing of gravity is investigated using the cells of wheat seedlings, amphibian embryos, and mammals. Exploration of the mammalian cell for sedimenting particles reveals that their existence is unlikely, especially in the presence of a network of microtubules and microfilaments considered to be responsible for intracellu...
Keywords: DIGITAL SYSTEMS; MULTIPLEXING; DATA ACQUISITION; ENVIRONMENTAL TESTS; FLIGHT TESTS; PULSE CODE MODULATION
Downloads: 81
[texts]Ionospheric effects on one-way timing signals - Soicher, H.
A proposed navigation concept requires that a user measure the time-delay that satellite-emitted signals experience in traversing the distance between satellite and user. Simultaneous measurement of the propagation time from four different satellites permits the user to determine his position and clock bias if satellite ephemerides and signal propagation velocity are known. A pulse propagating through the ionosphere is slowed down somewhat, giving an apparent range that is larger than the equiva...
Keywords: DIGITAL SYSTEMS; TELEMETRY; FREQUENCY CONTROL; FREQUENCY STANDARDS; MILITARY SPACECRAFT; NAVIGATION SATELLITES; COMMAND AND CONTROL; QUARTZ CRYSTALS; REMOTE CONTROL; RUBIDIUM
Downloads: 60
[texts]Speculations on Orbital Forcing of Sublimation from the Polar Caps - Hecht, M. H
Calculation of the periodic variations in the martian orbital parameters by Ward and subsequent refinements to the theory have inspired numerous models of variation of the martian water cycle. The limitations of models such as this can not be overstated. Albedo, for example, has a much greater influence on temperature than orbital forcing, and seems to be linked to insolation, possibly via its influence on dust transport...
Keywords: MISSION PLANNING; MICRODENSITOMETERS; LASERS; SCANNERS; SKY SURVEYS (ASTRONOMY); SPACEBORNE TELESCOPES; ULTRAVIOLET RADIATION; DIGITAL SYSTEMS; DATA COMPRESSION; ALGORITHMS; IMAGE ANALYSIS; AUGMENTATION
Downloads: 74
[texts]Tracking and orbit determination - NON
Kalman filtering for spectral factorization and matrix solution to spacecraft tracking problem
Keywords: ATTITUDE CONTROL; ELECTRIC PROPULSION; INTERPLANETARY SPACECRAFT; THRUST VECTOR CONTROL; DIGITAL SYSTEMS; ENGINE CONTROL; GYROSCOPES; SPACECRAFT CONTROL; STEPS
Downloads: 145
[texts]Einfaches Triebwerksmodell zur Simulation nichtlinearer dynamischer Schubantworten - Peter Krauspe (Author), Gunther Schänzer (Contributor)
A simple mathematical jet engine description is presented where the measured transition functions of the engine thrust can be simulated in a quasi-stationary operation as well as in acceleration or deceleration schedules. Because of its simplicity and high fidelity, it is especially suited for representing jet engines in digital simulation programs.
Keywords: approximation; computer programs; computerized simulation; digital systems; jet engines; mass flow; mathematical models; nonlinear systems; propulsion system performance; thrust
Downloads: 58
[texts]Characterization of Unsteady Flow Structures Near Landing-Edge Slat - Khorrami, Mehdi
In our previous computational studies of a generic high-lift configuration, quasi-laminar (as opposed to fully turbulent) treatment of the slat cove region proved to be an effective approach for capturing the unsteady dynamics of the cove flow field. Combined with acoustic propagation via Ffowes Williams and Hawkings formulation, the quasi-laminar simulations captured some important features of the slat cove noise measured with microphone array techniques...
Keywords: GUIDANCE SENSORS; RENDEZVOUS GUIDANCE; DIGITAL SYSTEMS; CAMERAS; THERMAL CYCLING TESTS; SIGNAL PROCESSING; THERMAL VACUUM TESTS; SEMICONDUCTOR LASERS; REFLECTORS
Downloads: 92
[texts]The inertia coefficients of an airship in a frictionless fluid - Bateman, H
The apparent inertia of an airship hull is examined. The exact solution of the aerodynamical problem is studied for hulls of various shapes with special attention given to the case of an ellipsoidal hull. So that the results for the ellipsoidal hull may be readily adapted to other cases, they are expressed in terms of the area and perimeter of the largest cross section perpendicular to the direction of motion by means of a formula involving a coefficient kappa which varies only slowly when the s...
Keywords: AUTOMATIC FLIGHT CONTROL; FORTRAN; AUTOMATIC PILOTS; COMPUTERIZED SIMULATION; CONTROLLABILITY; MANUAL CONTROL; COMMAND AND CONTROL; CONTROLLERS; DIGITAL SYSTEMS; FEEDBACK CONTROL
Downloads: 128
[texts]Role of artesian groundwater in forming Martian permafrost features - Howard, Alan D
Various landforms possibly related to formation (growth), movement, or decay of ground ice have been identified on Mars, including fretted terrain (ft) and associated lobate debris aprons (lda), the chaotic terrain, concentric crater fills (ccf), polygonal ground, softened terrain, small domes that are possibly pingos, and curvilinear (fingerprint) features (cuf). Glaciers may also have been present...
Keywords: CORRELATORS; PHOTONS; DATA CORRELATION; DIGITAL SYSTEMS; DIGITAL TECHNIQUES; LASER ANEMOMETERS; LIGHT SCATTERING; PHOTOMULTIPLIER TUBES; VELOCITY MEASUREMENT; OPTICAL PROPERTIES
Downloads: 76
[texts]NASA-TM-77053: A simple propulsion system model for the simulation of non-linar dynamic thrust response - Peter Krauspe (Author), Gunther Schänzer (Contributor)
A simple mathematical jet engine description is presented where the measured transition functions of the engine thrust can be simulated in a quasi-stationary operation as well as in acceleration or deceleration schedules. Because of its simplicity and high fidelity, it is especially suited for representing jet engines in digital simulation programs.
Keywords: approximation; computer programs; computerized simulation; digital systems; jet engines; mass flow; mathematical models; nonlinear systems; propulsion system performance; thrust
Downloads: 45
[texts]Fringe localization requirements for three-dimensional flow visualization of shock waves in diffuse-illumination double-pulse holographic interferometry - Decker, A. J
A theory of fringe localization in rapid-double-exposure, diffuse-illumination holographic interferometry was developed. The theory was then applied to compare holographic measurements with laser anemometer measurements of shock locations in a transonic axial-flow compressor rotor. The computed fringe localization error was found to agree well with the measured localization error. It is shown how the view orientation and the curvature and positional variation of the strength of a shock wave are ...
Keywords: CONTROLLERS; ROTARY WINGS; HELICOPTERS; SELF ADAPTIVE CONTROL SYSTEMS; VIBRATION DAMPING; ALGORITHMS; DIGITAL SYSTEMS; FEEDBACK CONTROL; KALMAN FILTERS; LEAST SQUARES METHOD
Downloads: 86
[texts]Students as Ground Observers for Satellite Cloud Retrieval Validation - Chambers, Lin H.
The Students' Cloud Observations On-Line (S'COOL) Project was initiated in 1997 to obtain student observations of clouds coinciding with the overpass of the Clouds and the Earth's Radiant Energy System (CERES) instruments on NASA's Earth Observing System satellites. Over the past seven years we have accumulated more than 9,000 cases worldwide where student observations are available within 15 minutes of a CERES observation...
Keywords: ARCHITECTURE (COMPUTERS); SYSTEMS ENGINEERING; PROGRAM VERIFICATION (COMPUTERS); FLIGHT CONTROL; DATA COLLECTION PLATFORMS; NUCLEAR MAGNETIC RESONANCE; FAULT TOLERANCE; DIGITAL SYSTEMS
Downloads: 94
[texts]FUNDAMENTAL CONSIDERATIONS ON SPINEL FORMATION IN SCALE LAYERS AND ON THE TRANSPORT PROPERTIES OF THE SPINELS - SCHMALZRIED, H
ALLOY OXIDATION IS INVESTIGATED FOR A CERTAIN PHASE CONFIGURATION OF THE TERNARY SYSTEM A-B-O. THE STRUCTURE, RANGE OF HOMOGENEITY, THERMODYNAMICS AND DEFECT CONCENTRATIONS, OF SPINELS ARE DISCUSSED FOR NUMEROUS EXAMPLES. THE FORMATION OF STABLE COATING LAYERS IS DESCRIBED.
Keywords: DIGITAL SYSTEMS; SPACEBORNE PHOTOGRAPHY; EARTH RESOURCES PROGRAM; MULTISPECTRAL PHOTOGRAPHY; OPTICAL DATA PROCESSING; CONFERENCES; DISPLAY DEVICES; EARTH RESOURCES; IMAGERY; REMOTE SENSORS
Downloads: 201
[texts]Water on Mars: Clue to accretional history - Carr, M. H
Geological evidence for large amounts of water at the Martian surface appears to be in conflict with geochemical evidence from SNC meteorites that suggests that the Mars mantle is dry and should have lost almost all of its initially large inventory of water during accretion. Here, several possibilities are suggested as to how the apparently conflicting data from two sources may be reconciled. The considerations examined indicate that several plausible explanations for the apparent conflict betwe...
Keywords: DATA CORRELATION; SHOT NOISE; DATA RETRIEVAL; DIGITAL SYSTEMS; DIGITAL TECHNIQUES; LASER ANEMOMETERS; VELOCITY MEASUREMENT; BACKSCATTERING; LIGHT SCATTERING; PHOTONS
Downloads: 82
[texts]Extended atmospheres of outer planet satellites and comets - Smyth, William H.
A major model documentation paper for cometary gas coronae and a second paper successfully applied the model to simulate the hydrogen Lyman-alpha coma of comet Kohoutek were completed and are discussed. New and very exciting data for the hydrogen distribution in the Saturn system obtained form earlier unreduced Voyager 1 and Voyager 2 data are preliminarily reviewed. This new data opens up a whole new series of investigations and indicate that Saturn's corona plays a major role in supplying hydr...
Keywords: CERAMICS; SENSITIVITY; SILICON CARBIDES; SILICON NITRIDES; VAPORIZING; VOIDS; FRACTOGRAPHY; NONDESTRUCTIVE TESTS; PHOTOACOUSTIC MICROSCOPY; DEFECTS; DIGITAL SYSTEMS; INCLUSIONS; MICROCRACKS; RADIOGRAPHY
Downloads: 73
[texts]The deep space network - Space programs summary, volume 2 - NON
Deep Space Network systems engineering and analysis research projects
Keywords: BIT SYNCHRONIZATION; SIGNAL TO NOISE RATIOS; SYMBOLS; DATA PROCESSING; DIGITAL TECHNIQUES; RANDOM ERRORS; SEQUENCING; APPROXIMATION; DIGITAL SYSTEMS; FILTERS; MAXIMUM PRINCIPLE
Downloads: 143
[texts]V/STOL model fan stage rig design report - Cheatham, J. G.
A model single-stage fan with variable inlet guide vanes (VIGV) was designed to demonstrate efficient point operation while providing flow and pressure ratio modulation capability required for a V/STOL propulsion system. The fan stage incorporates a split-flap VIGV with an independently actuated ID flap to permit independent modulation of fan and core engine airstreams, a flow splitter integrally designed into the blade and vanes to completely segregate fan and core airstreams in order to maximi...
Keywords: FAULT TOLERANCE; MARKOV PROCESSES; RELIABILITY ANALYSIS; SYSTEMS ANALYSIS; SYSTEMS ENGINEERING; DIGITAL SYSTEMS; DIGITAL TECHNIQUES; STATISTICAL ANALYSIS; SYSTEMS INTEGRATION
Downloads: 369
[texts]Space simulation - NON
Holographic study of xenon arc lamp heat loads for solar environmental simulations
Keywords: DIGITAL SYSTEMS; PHASE LOCKED SYSTEMS; RANGEFINDING; SPACECRAFT COMMUNICATION; COMBINATORIAL ANALYSIS; PHASE MODULATION; PHASE SHIFT KEYING; SIGNAL ENCODING; TRANSPONDERS
Downloads: 105
[texts]The Radiation Environment for the LISA/Laser Interferometry Space Antenna - Barth, Janet L.
The purpose of this document is to define the radiation environment for the evaluation of degradation due to total ionizing and non-ionizing dose and of single event effects (SEES) for the Laser Interferometry Space Antenna (LISA) instruments and spacecraft. The analysis took into account the radiation exposure for the nominal five-year mission at 20 degrees behind Earth's orbit of the sun, at 1 AU (astronomical unit) and assumes a launch date in 2014...
Keywords: LASER CAVITIES; DIODES; SEMICONDUCTOR LASERS; SURFACE EMITTING LASERS; PHOTOMETERS; FREE-SPACE OPTICAL INTERCONNECTS; DIGITAL SYSTEMS; CHIPS; TELECOMMUNICATION
Downloads: 122
[texts]Ku-Band rendezvous radar performance computer simulation model - Magnusson, H. G.
All work performed on the Ku-band rendezvous radar performance computer simulation model program since the release of the preliminary final report is summarized. Developments on the program fall into three distinct categories: (1) modifications to the existing Ku-band radar tracking performance computer model; (2) the addition of a highly accurate, nonrealtime search and acquisition performance computer model to the total software package developed on this program; and (3) development of radar c...
Keywords: COMPUTERS; PULSE GENERATORS; DATA PROCESSING EQUIPMENT; DATA TRANSMISSION; PERIPHERAL EQUIPMENT (COMPUTERS); SIGNAL PROCESSING; DIGITAL SYSTEMS; FLIP-FLOPS; INTERPROCESSOR COMMUNICATION; MULTIPLEXING
Downloads: 126
[texts]SPOCK: A TOOL FOR REAL TIME ARTIFICIAL INTELLIGENCE - LACROIX, J. P.
AIRBORNE EXPERT SYSTEMS MUST TAKE INTO ACCOUNT VERY HARSH REAL TIME CONDITIONS WHICH, WHEN COMBINED WITH THE ENVIRONMENTAL CONDITIONS OF THE OBJECT COMPUTER, REQUIRE THE DEVELOPMENT OF NEW SOLUTIONS. THE PROCEDURALIZATION OBTAINED BY COMPILING THE RETE ALGORITHM TOWARD SYMBOLIC, PROCEDURAL, OR REAL TIME ORIENTED TARGET LANGUAGES PROVIDES A SOLUTION TO THE PRIMARY PROBLEMS OF AIRBORNE APPLICATIONS: SPEED REQUIREMENTS, MEMORY CONTROL, HARMONIZATION OF SYMBOLIC PARTS WITH THE TRADITIONAL PORTIONS O...
Keywords: ARCHITECTURE; RELIABILITY; SIMULATORS; STATIC STABILITY; DESIGN ANALYSIS; DIGITAL SYSTEMS; FLIGHT CONTROL; PROVING; SYSTEMS ANALYSIS; FAULT TOLERANCE; REDUNDANCY; RELAXATION (MECHANICS)
Downloads: 129
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